fix: vueI18n resolution not using restructureDir defaults (#3159)

Author: BobbieGoede

specs/fixtures/empty_options/nuxt.config.ts

@@ -1,5 +1,8 @@
 // https://nuxt.com/docs/guide/directory-structure/nuxt.config
 export default defineNuxtConfig({
   compatibilityDate: '2024-04-03',
-  modules: ['@nuxtjs/i18n']
+  modules: ['@nuxtjs/i18n'],
+  i18n: {
+    restructureDir: false
+  }
 })

specs/fixtures/restructure/nuxt.config.ts

@@ -24,15 +24,11 @@ export default defineNuxtConfig({
   modules: [i18nModule, '@nuxtjs/i18n'],
 
   i18n: {
-    restructureDir: false,
     baseUrl: 'http://localhost:3000',
-    // langDir: 'lang',
-    // defaultLocale: 'fr',
     detectBrowserLanguage: false,
     compilation: {
       strictMessage: false
     },
-    restructureDir: 'i18n',
     defaultLocale: 'en',
     lazy: true,
     locales: [

src/layers.ts

@@ -89,8 +89,8 @@ export const mergeLayerPages = (analyzer: (pathOverride: string) => void, nuxt:
 }
 
 export function resolveI18nDir(layer: NuxtConfigLayer, i18n: NuxtI18nOptions, fromRootDir: boolean = false) {
-  if (i18n.restructureDir) {
-    return resolve(layer.config.rootDir, i18n.restructureDir)
+  if (i18n.restructureDir !== false) {
+    return resolve(layer.config.rootDir, i18n.restructureDir ?? 'i18n')
   }
 
   return resolve(layer.config.rootDir, fromRootDir ? '' : layer.config.srcDir)
@@ -153,9 +153,9 @@ export const getLayerLangPaths = (nuxt: Nuxt) => {
 
   for (const layer of nuxt.options._layers) {
     const i18n = getLayerI18n(layer)
-    if (!i18n?.restructureDir && i18n?.langDir == null) continue
+    if (i18n?.restructureDir === false && i18n?.langDir == null) continue
 
-    langPaths.push(resolveLayerLangDir(layer, i18n))
+    langPaths.push(resolveLayerLangDir(layer, i18n || {}))
   }
 
   return langPaths